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It’s not easy for the expert to ______ pig flu.in humans from regular human seasonal influenza.    

A. distinguish           B. separate            C. identify          D. recognize

A


解析:

考查动词词义辨析。句意:对专家来说不容易把人患的猪流感和普通流感区分开来。Distinguish---from把----与---分别开来;separate----from---把---与----分隔;identify辨别;recognize认出。

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